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Finding the Fourth Proportional to 666.77, 920.13 and 386.98

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Solution

The fourth proportional to 666.77, 920.13 and 386.98 is: 534.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.77 : 920.13 = 386.98 : x
  2. Step 2: Convert to fraction form
    666.77/920.13 = 386.98/x
  3. Step 3: Cross multiply
    666.77x = 920.13 × 386.98
  4. Step 4: Simplify right side
    666.77x = 356,068.16
  5. Step 5: Solve for x
    x = 356,068.16/666.77
  6. Step 6: Final answer
    x = 534.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.